Normally, hairy crabs are not edible once they die. The germs in hairy crabs are more numerous, and live crabs can be metabolically discharged to inhibit their reproduction, but if the metabolism slows down or disappears when the hairy crab is just dead or about to die, a large number of microorganisms in its body will use its rich nutrients to reproduce rapidly, thus causing the protein to deteriorate rapidly. In addition, after the death of hairy crabs, a toxic substance is produced in its body, which will be produced more and more as the hairy crab dies, and the toxin may still be present even after cooking, and the crab meat is corrupted and deteriorated at this time, so there is a risk of poisoning once people eat it. Hairy crabs contain a lot of high quality protein and amino acids, which can increase the immune function of lymphocytes and have the effect of promoting wound healing, but they are cold and it is recommended not to eat a lot of them.